When inspecting a BX, R, or RX seal ring groove with a Gagemaker BX-1000, the groove width can be obtained by inspecting the minor and major diameters. To measure the minor diameter, simply reverse the spring’s direction on the gage and re-set.*
First, measure the major diameter. Second, invert the spring. Then after setting, measure the minor diameter.
The groove width is half of the distance between the major and minor diameters, or rather:
Groove Width = (Major – Minor)/2.
*Consult your manual for procedure or download manual here. (PDF reader required)